Since Patch 2.0.3 Narain will tell you to read the book on the table in his house. Reading it will allow you to re-learn either Dragonscale, Elemental or Tribal leatherworking if you have removed your specialization.

After he has spoken about tradeskills, it says that he points over to a book called "Soothsaying for Dummies" which is a reference to the "For Dummies" series, as is the "Draconic for Dummies" book involved in the quest chain.